Theodor wohlmuth



2 Sheets-Sheet 1.

(No Model.)

T. WOHLMUTH.

LOGK

No. 471,453. Patented Mar. 22, 1892.

(No Model.) 2 Sheets-Sheet 2. T. WOHLMUTH.

LOCK.

No. 471,453. Patented Mar. 22, 1892.

Zizzsses: v bweizhr:

' its object the simplification of the lock mech- TATES THEODOR WOI-ILMUTH, OF VIENNA, AUSTRIA-HUNGARY.

LOCK.

SPECIFICATION forming part of Letters Patent No. 471,453, dated March 22, 1892.

Application filed July 9 1891.

To all whom it may concern:

Be it known that I, THEODOR WoHLMUTH, a subject of the Emperor of Austria-Hungary, residing at Vienna, in the Province of Lower Austria, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of refererence marked thereon, which form a part of this specification.

The invention relates to looks, and has for anism without detrimentally affecting or impairing the security of the lock, in so far as unauthorized tampering with the lock mech anism is concerned, whenever such security is desirable. v

To these ends the invention consists in structural features and in combinations of parts, as will now be fully described, reference being had to the accompanying drawings, in which- Figure 1 is a face view of the lock mechanism. Fig. 2 is a longitudinal sectional view through the bolt, thelatter being shown partly in plan. Fig. 3 is a vertical sectional view of the lock, taken about on line 00. :r of Fig. 1, the actuating-spring being omitted; and Fig. 4 is a perspective view of the key employed in the lock shown in Figs. 1 to 3. Figs. 5, 8, and 10 are views similar to Fig. 1, illustrating certain modifications, as well as the application of the invention to tumbler-locks and to latchbolts. Fig. 6 is a sectional view taken about on line y y of Fig. 5. Fig. 7 is a detail View. Fig. 9 is a section taken about on liner!) to of Fig. 8. Fig. 11 is a vertical sectional view taken about on line a z of Fig. 10.

Similar letters of reference indicate like parts wherever such may occur in the abovedescribed figures of drawings.

Referring more particularly to Figs. 1 to 4, inclusive, and to Fig. 7, the bolt A is guided by the usual slot in the lock-case G and by a keeper 00 that extends through a longitudinal slot a said keeper a also serving as a stop for the bolt to prevent its motion in either Serial No. 398,898. (No model.)

direction by engaging a notch a, at the rear end of slot at, said bolt being provided with another longitudinal slot a", at or near the rear end of which is formed a rib or projection a As shown in Fig. 1, the bolt A is thrown.

forward by means of a coiled spring a, one end of which is attached to the rear upper corner of the bolt, so as to lift said end and bring the locking-notch a into engagement with the keeper or stop c The lock-case O has a flattened key-barrel c for the introduction of the key B, Figs. 2, 3, and 4, and to prevent unauthorized tampering with the lock the barrel 0 may be provided with partitions c, the numberand length of which may be varied, the key being provided with suitable slits or slots 12 for said partitions, as shown in Fig. 2, or the key barrel or extension 0 may be provided with lugs or ribs 0 the key B being provided with suitable grooves b as shown in Fig. 7.

In order that a lock constructed as described may be opened, the key B has its outer end beveled in reverse directions, the bevel 19 acting upon the rib a to first depress the boltA and disengage it from the keeper a when said key is pushed into the key barrel or hole, while the incline 1) acts upon the bridge a between the slots a and a and moves the bolt Aback against the stress of the spring a.

It is obvious that unless the key B after being pushed into the lock is firmly held the bolt A, under the stress of its spring, will move the said key out again, so that it cannot be left in the look, as it will be ejected by the bolt as soon as released. This may be obviated by providing the key with a notch b, Fig. 6, and connecting with the escutcheon f a gravity-latch f, adapted to drop into said notch, thus locking the key and bolt against movement.

The wedgelaction of the key upon the bolt, which involves the main feature of my invention, may be applied to various styles of locks. For instance, it may be applied to a tumblerlock, an intermediate device being used to throw the bolt back. This application is illustrated in Figs. 5 and 6, the bolt and tumblers (1 being simultaneously lifted out of engagement with the keeper a by the incline b on the end of the key 13, the bolt being withdrawn against the stress of its spring a by the action of the incline Z) upon an arm 6 of a bell-crank lever E, whose other arm e engages a notch in the bolt A. The inclines l) and b on the end of the key are of course so arranged as to act successively, the forinerl) acting first to disengage the bolt or both the bolt and tumblers from their keeper, after which the incline l) acts upon the bolt or its actuatinglever to withdraw the same against the stress of its spring.

The spring for throwing the bolt forward may be dispensed with and said bolt thrown in either direction by means of the key, in which case the locking-notches that look the bolt against motion either when thrown forward or when withdrawn are preferably formed in the upper part of the slot (4 as shown at a a, Fig. 8, the slot a in this construction, which has the beveled hearing or bridge a being arranged below the said slot the bolt when the key is withdrawn falling back to its normal position, with one or the other of the notches a in engagement with the keeper a To insure this movement of the bolt, I preferably weight the rear end thereof, as shown at a Fig. 8, though the same result may be attained by the use of a spring a. (Shown in the same figure in dotted lines.)

In moving the bolt A in opposite directions when the lock is constructed as shown in Fi 8 the key has to be reversed, so that the incline b may act upon the bridge a after the incline b has lifted the bolt out of engagement with the keeper (L2, and to this end the said key is provided with an incline b on opposite sides, as shown in said Fig. 8. In the last-named figure I have shown the lock provided with a latch, the bolt A of which is also thrown forward by a spring (L21, said bolt having an inclined bearing-face a", operated by pushing or pulling a knob-spindle 7b in the direction of the arrow, Fig. 9, said spindle being provided with a laterally-projecting arn1 5 the outer face of which is beveled and acts upon the corresponding bearing a of the bolt A.

In Figs. 10 and 11 I have shown a nightlatch, theboltA of which may be locked by means of a key, the said bolt being thrown by means of a knob-spindle 72, through the medium of an intermediate lover. The knobspindle It has the laterally-projecting actuating-arm (J21, (shown in Figs. 8 and 9,) that has bearing upon the arm g of atwo-armed lever G, said arm g having a correspondingly inclined or beveled bearingface, while the arm g of said lever G lies between two lugs a a depending from the latch bolt A. The said bolt A is locked in either its forward or withdrawn position by means of a key 13 through the medium of an auxiliary bolt A arranged at right angles to the latch bolt A and adapted to engage a notch or slot a therein, and shown in dotted lines in Fig. 10. Vhen said auxiliary bolt is in its forward or locked position and when the latch-bolt A is thrown back, the lockingnose e of lever A may be thrown in front of a lug a on said bolt to lock the same against motion under the stress of its spring a. The auxiliary bolt is moved upward or downward by means of the key 13, that has the inclined actuating-face b, said face acting on a pin or stud a", projecting from the bolt across the key-hole. hen the key B is in the position shown in Fig. 11 in the key-hole and pushed in, it will lift the bolt A its spring-arm ridin g over the abutment a by means of which it is held in that position, the position of the key being reversed when the bolt A is to be moved downward, as will be readily understood. Thus when the parts are in the relative positions shownin Figs. 10 and 11 and the key B is pushed into the key-hole the locking-nose a: of the bolt A will enter the slot or notch 0. in the latch-bolt A and lock the same, as well as the knob-spindle h, against motion. If the key 13 is now reversed andinsorted into the key-hole the bolt A will be moved downward, thus releasing the latchbolt A, which may now be thrown back by the knob-spindle and locked into this position by again reversing the key, so as to move the bolt A upward to bring its nose a in front of the lug (vi-as willbe readily comprehended.

Having thus described myinvention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. In a lock, means for imparting motion to the-bolt, comprising coacting and reciprocallymovable wedges or inclined planes and intermediate transmitting devices, such as a lever, for transmitting the movement of one of said wedges or planes to the bolt, as and for the purpose set forth.

2. In a lock, the combination, with the bolt, a keeper therefor, a spring exerting its power to keep the bolt within said keeper, and a fixed locking device operating to lock the bolt against motion under the stress of its spring, of means for releasing the bolt and imparting motion thereto against the stress of its spring, comprising coacting and reciprocally-moving wedges or inclined planes operating to first release the bolt and then move the same against the stress of its spring, anda second fixed locking device automatically engaging the bolt when so moved and locking the same against motion under the stress of said spring, as and for the purpose set forth.

3. In a tumbler-lock, the combination, with the bolt and tumblers, of means for throwing the tumblers and bolt, comprisingcoacting and reciprocally-movable wedges or inclined planes and a lever operated 'by one of said wedges or planes to simultaneously throw the tumblers and bolt, as and for the purpose set forth.

IIO

4. In a lock, the combination, with the bolt and means for throwing the same, comprising coaoting and reciprocally-movable wedges or inclined planes and a lever operated by one of said wedges and operating the bolt, of a locking device for looking the bolt against motion, comprising coacting and reciprocallymovalole auxiliary wedges or inclined planes and an auxiliary looking-bolt operated by one 

